Effect of mean stress on hydrogen assisted fatique crack propagation in duplex stainless steel

T.J. Marrow; C.A. Hippsley; J.E. King

doi:10.1016/0956-7151(91)90224-O

Effect of mean stress on hydrogen assisted fatique crack propagation in duplex stainless steel

T.J. Marrow, C.A. Hippsley, J.E. King

Research output: Contribution to journal › Article › peer-review

Abstract

Hydrogen assisted subcritical cleavage of the ferrite matrix occurs during fatigue of a duplex stainless steel in gaseous hydrogen. The ferrite fails by a cyclic cleavage mechanism and fatigue crack growth rates are independent of frequency between 0.1 and 5 Hz. Macroscopic crack growth rates are controlled by the fraction of ferrite grains cleaving along the crack front, which can be related to the maximum stress intensity, K_max. A superposition model is developed to predict simultaneously the effects of stress intensity range (ΔK) and K ratio (K_min/K_max). The effect of K_max is rationalised by a local cleavage criterion which requires a critical tensile stress, normal to the {001} cleavage plane, acting over a critical distance within an embrittled zone at the crack tip. © 1991.

Original language	English
Pages (from-to)	1367-1376
Number of pages	10
Journal	Acta Metallurgica et Materialia
Volume	39
Issue number	6
DOIs	https://doi.org/10.1016/0956-7151(91)90224-O
Publication status	Published - Jun 1991

Keywords

hydrogen
iron and steel metallography
stresses
Ferrite
fatigue crack propagation
stainless steel

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10.1016/0956-7151(91)90224-O

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title = "Effect of mean stress on hydrogen assisted fatique crack propagation in duplex stainless steel",

abstract = "Hydrogen assisted subcritical cleavage of the ferrite matrix occurs during fatigue of a duplex stainless steel in gaseous hydrogen. The ferrite fails by a cyclic cleavage mechanism and fatigue crack growth rates are independent of frequency between 0.1 and 5 Hz. Macroscopic crack growth rates are controlled by the fraction of ferrite grains cleaving along the crack front, which can be related to the maximum stress intensity, Kmax. A superposition model is developed to predict simultaneously the effects of stress intensity range (ΔK) and K ratio (Kmin/Kmax). The effect of Kmax is rationalised by a local cleavage criterion which requires a critical tensile stress, normal to the {001} cleavage plane, acting over a critical distance within an embrittled zone at the crack tip. {\textcopyright} 1991.",

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TY - JOUR

T1 - Effect of mean stress on hydrogen assisted fatique crack propagation in duplex stainless steel

AU - Marrow, T.J.

AU - Hippsley, C.A.

AU - King, J.E.

PY - 1991/6

Y1 - 1991/6

N2 - Hydrogen assisted subcritical cleavage of the ferrite matrix occurs during fatigue of a duplex stainless steel in gaseous hydrogen. The ferrite fails by a cyclic cleavage mechanism and fatigue crack growth rates are independent of frequency between 0.1 and 5 Hz. Macroscopic crack growth rates are controlled by the fraction of ferrite grains cleaving along the crack front, which can be related to the maximum stress intensity, Kmax. A superposition model is developed to predict simultaneously the effects of stress intensity range (ΔK) and K ratio (Kmin/Kmax). The effect of Kmax is rationalised by a local cleavage criterion which requires a critical tensile stress, normal to the {001} cleavage plane, acting over a critical distance within an embrittled zone at the crack tip. © 1991.

AB - Hydrogen assisted subcritical cleavage of the ferrite matrix occurs during fatigue of a duplex stainless steel in gaseous hydrogen. The ferrite fails by a cyclic cleavage mechanism and fatigue crack growth rates are independent of frequency between 0.1 and 5 Hz. Macroscopic crack growth rates are controlled by the fraction of ferrite grains cleaving along the crack front, which can be related to the maximum stress intensity, Kmax. A superposition model is developed to predict simultaneously the effects of stress intensity range (ΔK) and K ratio (Kmin/Kmax). The effect of Kmax is rationalised by a local cleavage criterion which requires a critical tensile stress, normal to the {001} cleavage plane, acting over a critical distance within an embrittled zone at the crack tip. © 1991.

KW - hydrogen

KW - iron and steel metallography

KW - stresses

KW - Ferrite

KW - fatigue crack propagation

KW - stainless steel

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DO - 10.1016/0956-7151(91)90224-O

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JO - Acta Metallurgica et Materialia

JF - Acta Metallurgica et Materialia

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Effect of mean stress on hydrogen assisted fatique crack propagation in duplex stainless steel

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